HLA-DRB1 and psoriasis: Interestingly, previous work has also correlated aberrant methylation of HLA-DRB1 with the prognosis of some diseases, thus, we hypothesis that methylation status of HLA-DRB1 may also affect the prognosis and recurrence of psoriasis, which can be proposed as our future direction for the investigation of HLA-DRB1 methylation in psoriasis.